Posts Tagged ‘skype’

Come Skype oltrepassa i firewall

Monday, April 28th, 2008

Tutti abbiamo scoperto che Skype e` un software che funziona in ambienti di rete variagati e dove la sopravvivenza e` difficile, ad esempio funziona se posto dietro la gran parte dei firewall, in una rete che il cui router effetua NAT o addirittura riesce a funzionare anche senza aver un server DNS funzionante.

Segnalo l’articolo “The hole trick – How Skype & Co. get round firewalls”  di Jürgen Schmidt che illustra alcune delle tecniche usate da Skype per avere connettivita` in “reti difficili”.

The down of Skype

Saturday, August 18th, 2007

As you can see in this and this graphs in the past days there is an outage of Skype.
The facts are:

  1. There was e big Skype outage
  2. A Sype DoS exploit is published
  3. Skype released a new upstream version

Skype said that the outage is not caused by a DoS attack, but like a big company do, said that was a software issue.
I think that the exploit published is a fake, because for me don’t work, and other have documented this here.
Another glance through Desclaux and Kortchinsky suggests, in addition to traffic from clients to login servers, Skype
generates a lot of traffic between the login servers and supernodes (see slide 16 for example). This makes the login servers a doubly critical piece of Skype infrastructure. Of course, if they merely introduced a bug in their login servers, it shouldn’t take 12-24 hours to do a roll back.
So this outage can be caused by a Sype network or Skype server issue.
Another good point is that this week a Snort Skype preprocessor was published.
But no one out of Skype known the truth.


Tuesday, November 23rd, 2004

Skype e’ un programma per il voip, veloce e funziona anche dietro nat.
Questo e’ il repository dove ho trovato il client skype pacchettizzato per debian:

deb unstable maindeb-src unstable main